Knight is the assistant wrestling coach at West Montgomery Middle School. Deputies say Knight and the student had several encounters off campus from December 2012 to January 2013.

Deputies say the girl's mother knew about the encounters with Carr, but it was not clear if she knew about the encounters with Knight.

Knight is being held in the Montgomery County Jail under a $20,000 secured bond.

Montgomery County Schools Superintendent David Ellis talked about the issues in a news release Sunday. He says the girl's mother, a former school system employee, knew about the incidents.

"I have worked over a decade in personnel management and this is the most unusual, unique set of situations I have ever investigated. Sadly, the behavior was condoned and encouraged. The victim's mother, an employee in our school system who has been terminated, allegedly knew about the inappropriate relationships and simply did nothing to address the inappropriate behaviors. Furthermore, she did not notify anyone involved with the school system that these activities had occurred."